Answer
$C=16lwh$
Work Step by Step
Since $C$ is jointly/directly proportional to $l$, $w$, and $h$, we have:
$C=klwh$
We are given: $C=128$ and $l=w=h=2$, so we have:
$128=k*2*2*2=8k$
$k=128/8=16$
So the equation is:
$C=16lwh$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 1, Equations and Graphs - Section 1.10 - Modeling Variation - 1.10 Exercises - Page 164: 27
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